From: Grant Grundler <grundler@parisc-linux.org>
To: Matej Martini <calibrator@gmx.net>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] C3600 install
Date: Sun, 13 Jun 2004 14:19:53 -0600 [thread overview]
Message-ID: <20040613201953.GA28264@colo.lackof.org> (raw)
In-Reply-To: <26521.1087071140@www66.gmx.net>
On Sat, Jun 12, 2004 at 10:12:20PM +0200, Matej Martini wrote:
> > This is actually a kernel problem; I also see this.... I talked to Grant
> > about this a bit, but we haven't reached a good conclusion. If you can
> > find a 2.6 based install, it should work.....
We need to shut down any devices the PDC has left in a state
where it might do DMA *Before* reprogramming the IOMMU.
Knowing which devices to shutdown this early and how to access
then is non-trivial.
> >
> > this is the bit that needs fixing, in arch/parisc/kernel/inventory.c...
> > with this it should boot.
> >
> > - pdc_suspend_usb();
> > +/* pdc_suspend_usb(); */
Yeah - this is a "trivial" fix for a difficult problem.
An alternative solution would be to disconnect all USB devices.
I'm hoping firmware doesn't enable DMA for USB ports if it doesn't find
anything.
grant
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next prev parent reply other threads:[~2004-06-13 20:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-12 8:38 [parisc-linux] C3600 install Matej Martini
2004-06-12 17:31 ` Randolph Chung
2004-06-12 20:12 ` Matej Martini
2004-06-13 20:19 ` Grant Grundler [this message]
2004-06-13 22:52 ` Randolph Chung
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